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Reviews (1)

18 December 2015
Sumax-Blue-8mm-Custom-Spark-Plug-Wires-for-Harley-99-15-FXD-Dyna-20631/141667515249
These spark plug wires are not ohm stable, my Harley constantly displaying error codes stating misfires in both cylinders. Upon reinstalling the stock issued Harley Davidson wires, no error codes are displayed. Both sets of wires (Sumax & stock) were tested and installed at a Harley Davidson service center, tech stated the Sumax wires are not recommended for Harley use. 2004 Harley Davidson FXDWGI.